Theory of the STM detection of Wigner molecules in spin-incoherent CNTs
Dipartimento di Fisica, Università di Genova - Via Dodecaneso 33, 16146, Genova, Italy, EU and CNR-SPIN - Via Dodecaneso 33, 16146, Genova, Italy, EU
Received: 15 March 2013
Accepted: 14 May 2013
The linear conductance of a carbon nanotube quantum dot in the Wigner molecule regime, coupled to two scanning tunnel microscope tips is inspected. Considering the high-temperature regime, the nanotube quantum dot is described by means of the spin-incoherent Luttinger liquid picture. The linear conductance exhibits spatial oscillations induced by the presence of the correlated, molecular electron state. A power-law scaling of the electron density and one of the conductance as a function of the interaction parameter are found. They confirm local transport as a sensitive tool to investigate the Wigner molecule. The double-tip setup allows to explore different transport regimes with different shapes of the spatial modulation, all bringing information about the Wigner molecule.
PACS: 74.55.+v – Tunneling phenomena: single particle tunneling and STM / 73.23.-b – Electronic transport in mesoscopic systems / 71.10.Pm – Fermions in reduced dimensions (anyons, composite fermions, Luttinger liquid, etc.)
© EPLA, 2013